100bestbuy fraud for ipad winning contest

On 26th of june I get a call from 100bestbuy.Com and they said you have been selected as a winner of an ipad worth rupees 920 I said I never called then they said sir it is a good opportunity I said I am not exactly want to buy it .And I will give you exact answer within some hours they replied a call from courier company should be there but getting no call from any courier company they delivered directly to my home I am not at home that time my mother recived it with full payment sir I am helpless here I am from a very average family I cant afford this plz help to get my money back